Determine the mass of the reaction product of the combustion of magnesium if it is known

Determine the mass of the reaction product of the combustion of magnesium if it is known that the amount of magnesium substance is 5 mol. Please note that when magnesium burns, it forms an oxide in which it exhibits an oxidation state of +2.

Given:
n (Mg) = 5 mol
To find:
m (MgO)
Decision:
2Mg + O2 = 2MgO
n (Mg): n (MgO) = 1: 1
n (MgO) = 5 mol
m (MgO) = n * M = 5 mol * 40 g / mol = 200 g
Answer: 200 g